Hello all I am into photography just solely for the purpose of enjoyment, and also the love of photography it self. After reading the posts about this camera lens, one poster wrote "do we expect too much? " I at this time wish to convey my best whishes to the fellow photographer who just spent such a great amount of his hard earned money, ( 2,500 ) dollars and after paying such a great amount ended up with a lens that was defective. My answer to the question, (IMHO) is a resounding NO NO NO ! we are not expecting too much after spending that much money on a lens that was supposed to be of the utmost quality. The cost of that lens, In my opinion alone should warrant a top notch pristine lens. Enough of my ranting.